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1. tan θ = 12

  • A. 23
  • B. 23
  • C. 23
  • D. 23

Answer: Option D

Explanation:

 tanθ=1/2

বা θ= tan^-1( 1/2)

এখন, sin 2θ

 বা sin 2 tan^-1 (1/2)

বা sin tan ^-1 (2*1/2)/(1-1/4)

বা sin tan^-1 1/(3/4)

বা sin tan^-1 4/3

বা sin sin^-1 4/5

বা 4/5 উত্তর


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